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use std::error; use std::fmt; /// Returned when borrowing fails. #[derive(Debug)] pub struct InvalidThreadAccess; impl fmt::Display for InvalidThreadAccess { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { fmt::Display::fmt(error::Error::description(self), f) } } impl error::Error for InvalidThreadAccess { fn description(&self) -> &str { "fragile value accessed from foreign thread" } }